LLaMA-7B adapted for LlamaModel and LlamaTokenizer provided after transformers 4.28.0.
Loading with AutoModel and AutoTokenizer now supported for checkpoints in this repo.
This is under a special license, please see the LICENSE file for details.
Model details
Organization developing the model
The FAIR team of Meta AI.
Model date
LLaMA was trained between December. 2022 and Feb. 2023.
Model version
This is version 1 of the model.
Model type
LLaMA is an auto-regressive language model, based on the transformer architecture. The model comes in different sizes: 7B, 13B, 33B and 65B parameters.
Where to send questions or comments about the model
Questions and comments about LLaMA can be sent via the GitHub repository of the project , by opening an issue.
Intended use
Primary intended uses
The primary use of LLaMA is research on large language models, including:
exploring potential applications such as question answering, natural language understanding or reading comprehension,
understanding capabilities and limitations of current language models, and developing techniques to improve those,
evaluating and mitigating biases, risks, toxic and harmful content generations, hallucinations.
Primary intended users
The primary intended users of the model are researchers in natural language processing, machine learning and artificial intelligence.
Out-of-scope use cases
LLaMA is a base, or foundational, model. As such, it should not be used on downstream applications without further risk evaluation and mitigation. In particular, our model has not been trained with human feedback, and can thus generate toxic or offensive content, incorrect information or generally unhelpful answers.
Factors
Relevant factors
One of the most relevant factors for which model performance may vary is which language is used. Although we included 20 languages in the training data, most of our dataset is made of English text, and we thus expect the model to perform better for English than other languages. Relatedly, it has been shown in previous studies that performance might vary for different dialects, and we expect that it will be the case for our model.
Evaluation factors
As our model is trained on data from the Web, we expect that it reflects biases from this source. We thus evaluated on RAI datasets to measure biases exhibited by the model for gender, religion, race, sexual orientation, age, nationality, disability, physical appearance and socio-economic status. We also measure the toxicity of model generations, depending on the toxicity of the context used to prompt the model.
Metrics
Model performance measures
We use the following measure to evaluate the model:
Accuracy for common sense reasoning, reading comprehension, natural language understanding (MMLU), BIG-bench hard, WinoGender and CrowS-Pairs,
Exact match for question answering,
The toxicity score from Perspective API on RealToxicityPrompts.
Decision thresholds
Not applicable.
Approaches to uncertainty and variability
Due to the high computational requirements of training LLMs, we trained only one model of each size, and thus could not evaluate variability of pre-training.
Evaluation datasets
The model was evaluated on the following benchmarks: BoolQ, PIQA, SIQA, HellaSwag, WinoGrande, ARC, OpenBookQA, NaturalQuestions, TriviaQA, RACE, MMLU, BIG-bench hard, GSM8k, RealToxicityPrompts, WinoGender, CrowS-Pairs.
Training dataset
The model was trained using the following source of data: CCNet [67%], C4 [15%], GitHub [4.5%], Wikipedia [4.5%], Books [4.5%], ArXiv [2.5%], Stack Exchange[2%]. The Wikipedia and Books domains include data in the following languages: bg, ca, cs, da, de, en, es, fr, hr, hu, it, nl, pl, pt, ro, ru, sl, sr, sv, uk. See the paper for more details about the training set and corresponding preprocessing.
Quantitative analysis
Hyperparameters for the model architecture
LLaMA
Model hyper parameters
Number of parameters
dimension
n heads
n layers
Learn rate
Batch size
n tokens
7B
4096
32
32
3.0E-04
4M
1T
13B
5120
40
40
3.0E-04
4M
1T
33B
6656
52
60
1.5.E-04
4M
1.4T
65B
8192
64
80
1.5.E-04
4M
1.4T
Table 1 - Summary of LLama Model Hyperparameters
We present our results on eight standard common sense reasoning benchmarks in the table below.
LLaMA
Reasoning tasks
Number of parameters
BoolQ
PIQA
SIQA
HellaSwag
WinoGrande
ARC-e
ARC-c
OBQA
COPA
7B
76.5
79.8
48.9
76.1
70.1
76.7
47.6
57.2
93
13B
78.1
80.1
50.4
79.2
73
78.1
52.7
56.4
94
33B
83.1
82.3
50.4
82.8
76
81.4
57.8
58.6
92
65B
85.3
82.8
52.3
84.2
77
81.5
56
60.2
94
*Table 2 - Summary of LLama Model Performance on Reasoning tasks*
We present our results on bias in the table below. Note that lower value is better indicating lower bias.
No
Category
FAIR LLM
1
Gender
70.6
2
Religion
79
3
Race/Color
57
4
Sexual orientation
81
5
Age
70.1
6
Nationality
64.2
7
Disability
66.7
8
Physical appearance
77.8
9
Socioeconomic status
71.5
LLaMA Average
66.6
Table 3 - Summary bias of our model output
Ethical considerations
Data
The data used to train the model is collected from various sources, mostly from the Web. As such, it contains offensive, harmful and biased content. We thus expect the model to exhibit such biases from the training data.
Human life
The model is not intended to inform decisions about matters central to human life, and should not be used in such a way.
Mitigations
We filtered the data from the Web based on its proximity to Wikipedia text and references. For this, we used a Kneser-Ney language model and a fastText linear classifier.
Risks and harms
Risks and harms of large language models include the generation of harmful, offensive or biased content. These models are often prone to generating incorrect information, sometimes referred to as hallucinations. We do not expect our model to be an exception in this regard.
Use cases
LLaMA is a foundational model, and as such, it should not be used for downstream applications without further investigation and mitigations of risks. These risks and potential fraught use cases include, but are not limited to: generation of misinformation and generation of harmful, biased or offensive content.
